Its prevention of life gain and prohibiting damage prevention is what makes it so scary - for some strategies, life gain or "fog" effects get them through scary turns against aggressive Red decks, which is no longer an option when Sunspine Lynx is in play
Unlike regular games of Magic, every player starts with 40 health, although your commander only needs to deal 21 damage to knock someone out
Get rid of something like Gaeas Cradle or Nykthos, Shrine to Nyx to make a lot of mana
To me, these are the main reasons why sacrifice decks tend to so easily stumble into infinite combos
Then they should attack 3 basic Energy to 1 of Pokmon
Its rarity stems from a low pull ratea key factor in driving up the value, making it a hot commodity in the increasingly popular Evolving Skies set within the Sword & Shield series